Cisco Cisco IOS Software Release 12.4(2)XB6

This feature provides enhanced termination and re-origination of signaling and media between VoIP and 
video networks in conformance with RFC3261. 

New H.323-to-SIP features available include the following: 

Support H.323-to-SIP Supplementary services for Cisco Unified CallManager with MTP on the 
H.323 Trunk. 

ILBC Codec Support 

Interworking between G.711 inband DTMF to RFC2833 

VXML 3.x support 

VXML support with SIP Notify 

New SIP-to-SIP features available include: 

Interworking between G.711 inband DTMF to RFC2833

For more information about this feature, see the following URL:

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use 
Cisco MIB Locator found at the following URL:

Before you can run the high-density packet voice feature card for the Cisco AS5350XM or 
Cisco AS5400XM universal gateway, you must install an IP Plus image (minimum) of Cisco IOS 
Release 12.4(6)XE or a later release. 

Software echo cancellation is the default configuration—G.168-compliant echo cancellation is 
enabled by default with a coverage of 64 milliseconds. Hardware echo cancellation is not available.

Only Packet Fax/Voice DSP modules (PVDM2s) are supported on the Voice Feature Card.

GSMAMR NB codec support is available only with H.323 and Session Initiation Protocol (SIP) as 
call control protocols.

Skinny Client Control Protocol (SCCP) is not supported.

To use the AS5X-FC voice feature card in your gateway, at least one card must be present during 
bootup. Additional AS5X-FC voice feature cards can be installed later. 

If you use AMR-NB DSPware, all the DSPs in the system must be upgraded with the GSM AMR-NB 
supported DSPware.